<!doctype html> 
<html> 
<head> 
    <meta charset="utf-8"> 
    <title></title> 
</head>
<body>
<script type="text/javascript">

var a = {};
function show(a){
	//a = {'c':10,'s':20};
	//a = {'c':10,'s':25};
	a.s = a.c + 15;
}
function show2(a){
	a.c = 10;//a = {'c':10}
	a.s = 20;//a = {'c':10,'s':20};
	show.apply(this,arguments);
	//alert(arguments[0].s);
	this.k = a;
	//a.b = 20;
	this.k = a
	//a.b= 20;
	this.k.b = 20;
};
new show2(a);
alert(a.b)
//alert(a.b);

</script>
</body>
</html>